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Key Facts In This Video
It's not true that if two animals can breed and produce fertile offspring, then they're the same species. Polar bears and grizzly bears are definitely not the same species. 01:25
We know that grolar bears are fertile, because in 2010, hunters shot a bear that was the offspring of a grolar bear and a brown bear. 01:52
The northern range of the grizzly bear has been increasing as temperatures get more mild, and as the ice melts, polar bears have been forced onto land. 02:07